A lot of older car stereos have unused inputs used for fancy options of the day like trunk cd changers or whatever. My cars 03 stereo has that option and originally had a tape option but my car doesn't have them and thus the inputs in the back are unused. To add this adaptation all you need to do is find out how to enable one of these options on your receiver to "trick" your receiver as in: put it on "tape" to get bluetooth. usually this is as simple as connecting 2 wires and theres videos all over youtube for specific stereos and units. Once you enable an option find power and the input terminals on the head and make sure you don't blow you usb. You might need to patch a wire from a cigarette lighter to the usb power adapter or something to power the BT adapter with...

A lot of older car stereos have unused inputs used for fancy options of the day like trunk cd changers or whatever. My cars 03 stereo has that option and originally had a tape option but my car doesn't have them and thus the inputs in the back are unused. To add this adaptation all you need to do is find out how to enable one of these options on your receiver to "trick" your receiver as in: put it on "tape" to get bluetooth. usually this is as simple as connecting 2 wires and theres videos all over youtube for specific stereos and units. Once you enable an option find power and the input terminals on the head and make sure you don't blow you usb. You might need to patch a wire from a cigarette lighter to the usb power adapter or something to power the BT adapter without blowing it.

the ones I came up with are super tiny and look hard to mod. I will post if I find the one in the guide